#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;
int main()
{
    char s[100];
    int i;
    cin.getline(s,100);
    for (i=0;s[i];i++)
    {
        if (s[i-1]==' ' && s [i]==' ')
        strcpy (s+i, s+i+1);
    }
    cout<<s;
    return 0;
}